Multi-scale modelling for hydrodynamic and morphological changes of breakwater in coastal Mekong Delta in Vietnam

Xuan, Tu Le; Cong, Phong Nguyen; Thanh, Vo Quoc; Tran, Quoc Quan; Wright, David P.; Anh, Duong Tran

doi:10.1007/s11852-022-00866-3

Cited by 9 publications

(7 citation statements)

References 26 publications

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“…The tidal range varies between +1.8 and +2.2 m [61]. To date, much information is available related to the hydrodynamics and sedimentation conditions of the Tan Phu Dong district, which includes Ngang Island [66][67][68].…”

Section: Site Descriptionmentioning

confidence: 99%

“…The average wave height is greater than 0.64 m approximately 5 km off the shore, while the main direction of the incident waves is from the east. In contrast, the average wave height near the shore is less than 0.3 m during the southwest monsoon, and the main direction of the incoming waves is from the southeast [67]. The suspended sediment concentration (SSC) in the Tieu River ranges between 0.1 and 0.2 kg /m 3 in the dry season and between 0.3 and 0.4 kg /m 3 in the wet season [71] (Figure 1).…”

Section: Site Descriptionmentioning

confidence: 99%

“…This knowledge is important, particularly in contexts where mangrove forests are believed to trap sediments and contribute to the progradation and aggradation of deltas [61,62]. In addition, the existing coastal erosion control measures (ecological engineering solutions-mangrove transplantation-and engineered solutions-construction of shoreline and offshore protection structures) emphasize the utility of planting of mangrove seedlings in an attempt to trap sediment to establish intertidal mudflats and stabilize eroded coastal areas in Southeast Asia [63][64][65], including Vietnam [48,57,[66][67][68][69].…”

Section: Introductionmentioning

confidence: 99%

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Morphological Evolution of an Intertidal Mudflat in Relation to Mangrove Growth: Implications for Future Erosion Control

Phong,

Thuan,

Loi

et al. 2024

Life

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There is limited information regarding the influence of mangrove growth on the morphological evolution of intertidal mudflats. In this study, Tan Phu Dong district, Tien Giang Province, Vietnam, was selected for investigating how mangrove growth influenced the morphological evolution of an intertidal mudflat. The authors analyzed a series of satellite images (from 1995 and 2022), calculated the enhanced vegetation index (EVI), and documented field visits and observations in pursuit of the objective of the study. The findings revealed that fine-grained sediment accumulated as unconsolidated substratum (US) in the first step of the morphological evolution of the intertidal mudflat, with sediment accumulation of 910 ha in 1995. The US provided favorable conditions for mangroves to grow, while mangrove growth helped compact the US into a compact substratum (CS) in addition to promoting continuous sediment accumulation, increased the vegetation cover of the island, and elevated the substrate density of the remaining areas. As a result, the US and CS decreased steadily between 1995 and 2020, from 910 ha in 1995 to 401 ha in 2020 and from 433 ha in 2005 to 111 ha in 2020, respectively. Meanwhile, the low-vegetation area (LVA), medium-vegetation area (MVA), and high vegetation area (HVA) gradually increased between 1995 and 2015, from 0 ha in 1995 to 104 ha in 2015, from 0 ha in 1995 to 96 ha in 2015, and from 0 ha in 1995 to 114 ha in 2015, respectively. However, the LVA decreased slightly between 2015 and 2020 due to significant sand accumulation, which significantly killed the mangrove trees. In contrast, the MVA and HVA steadily increased between 2015 and 2020, from 96 ha in 2015 to 116 ha in 2020 and from 114 ha in 2015 to 221 ha in 2020, respectively. In 2022, there was a steady increase in HVA (298 ha in 2022), although the date of the 2022 satellite retrieval was 28 January 2022. This study recommends that the technical design of the existing coastal protection works should be revised or adapted to take account of sediment accumulation as the first step in the morphological evolution of the examined intertidal mudflat, rather than mangrove growth.

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Section: Site Descriptionmentioning

confidence: 99%

Section: Site Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Morphological Evolution of an Intertidal Mudflat in Relation to Mangrove Growth: Implications for Future Erosion Control

Phong,

Thuan,

Loi

et al. 2024

Life

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“…Among various numerical models, Mike 21 is flexible and convenient for inputting and integrating data, as well as analyzing and displaying results, and it applies to a wide range of complex environments [19]. For example, Le et al [20] used it to study the hydrodynamic changes to the coastal Mekong Delta in Vietnam before and after the construction of 10 embankments. Nguyen et al [21] also simulated the transport and diffusion of pollutants in Danang Bay, Vietnam, and analyzed the causes of water quality deterioration with Mike 21. In this study, the focus is on southwestern Laizhou Bay, and we propose connecting the two rivers located on both sides of the embankments to improve hydrodynamics and thus water quality in the bay.…”

Section: Introductionmentioning

confidence: 99%

Improving Water Quality in a Sea Bay by Connecting Rivers on Both Sides of a Harbor

Chi,

Zhang,

Liu

et al. 2024

JMSE

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Improving water quality is imperative for many sea bays, including Laizhou Bay, China, to achieve sustainable marine development. In 2010, two 17.3 km long sand-retaining embankments were built in southwestern Laizhou Bay, which weakened the nearshore hydrodynamics and seriously impacted the water quality. To mitigate this issue, this study proposes connecting the two rivers on both sides of the embankments to improve the hydrodynamics and thus water exchange in the sea bay. The effectiveness was examined with a numerical model using Mike 21, which was validated for both tidal current velocity and direction at six monitoring locations in the sea bay. The results show that over 53% of the core research area displays an increase (0.0–0.4 m/s) in tidal current speed after the connection, primarily in and around the Haihengwei Fishing Port. Meanwhile, the Eulerian residual currents in the Haihengwei Fishing Port, Mi River estuary and Bailang River estuary become substantially larger (with a maximum increase of 0.16 m/s). In addition, the net transport distance of particles released near the connection increases by up to 39.89 km in one month. Overall, this case study demonstrates that connecting rivers next to a harbor can effectively improve hydrodynamics and thus improve water quality in the bay.

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“…(2017) argued that hard coastal structures artificially fix the coastline but compromise the ability of beaches to adapt to changing conditions, leading to passive and aggressive ecological consequences. Breakwaters also significantly interrupt nearshore hydrodynamic regimes and sediment transport ( Amalan et al., 2018 ; Le Xuan et al., 2022 ), affecting surrounding assemblage structures ( Martins et al., 2009 ). Some researchers consider breakwaters to be non-adaptive, as they are costly to build and to maintain in response to a changing climate ( Schoonees et al., 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Environmental impact of submerged and emerged breakwaters

Saengsupavanich

Ariffin

Yun

et al. 2022

Heliyon

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Multi-scale modelling for hydrodynamic and morphological changes of breakwater in coastal Mekong Delta in Vietnam

Cited by 9 publications

References 26 publications

Morphological Evolution of an Intertidal Mudflat in Relation to Mangrove Growth: Implications for Future Erosion Control

Morphological Evolution of an Intertidal Mudflat in Relation to Mangrove Growth: Implications for Future Erosion Control

Improving Water Quality in a Sea Bay by Connecting Rivers on Both Sides of a Harbor

Environmental impact of submerged and emerged breakwaters

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